I also faced the same issue. The solution to this problem is Models/Issue.php
By default the GII has defined the relation funtion like this
public function relations()
{
// NOTE: you may need to adjust the relation name and the related
// class name for the relations automatically generated below.
return array(
'owner' => array(self::BELONGS_TO, 'TblUser', 'owner_id'),
'project' => array(self::BELONGS_TO, 'TblProject', 'project_id'),
'requester' => array(self::BELONGS_TO, 'TblUser', 'requester_id'),
);
}

Since we dont have TblUser, TblProject classes. just remove the Tbl and keep it simple as Project and User.
This will solve the problem.